ASTM C1649-14(2021) - 1.7.2021
 
Significance and Use

4.1?Color measurement quantifies the transmitted color for glass. The user defines an acceptable range of color appropriate for the end use. A typical quality concern for transmittance color measurement of glass products is verification of lot-to-lot color consistency for end-user acceptance.

4.2?If the transmitted color of a glass product is consistent from lot-to-lot and within agreed supplier-buyer acceptance criteria, the products color is expected to be consistent and acceptable for end-use.

 
1. Scope

1.1?This practice provides guidelines for the instrumental transmittance measurement of the color of coated and uncoated transparent glass. (See Terminology E284.)

1.2?The practice specifically excludes fluorescent and iridescent samples.

1.3?The values stated in SI units are to be regarded as the standard. The values given in parentheses are for information only.

1.4?This standard does not purport to address all of the safety concerns, if any, associated with its use. It is the responsibility of the user of this standard to establish appropriate safety, health, and environmental practices and determine the applicability of regulatory limitations prior to use.

1.5?This international standard was developed in accordance with internationally recognized principles on standardization established in the Decision on Principles for the Development of International Standards, Guides and Recommendations issued by the World Trade Organization Technical Barriers to Trade (TBT) Committee.

 
2. Referenced Documents

E1164-23

Standard Practice for Obtaining Spectrometric Data for Object-Color Evaluation

D2244-23

Standard Practice for Calculation of Color Tolerances and Color Differences from Instrumentally Measured Color Coordinates

CIE 15:2004

Colorimetry

E1348-22

Standard Test Method for Transmittance and Color by Spectrophotometry Using Hemispherical Geometry

E179-17(2022)

Standard Guide for Selection of Geometric Conditions for Measurement of Reflection and Transmission Properties of Materials

E308-22

Standard Practice for Computing the Colors of Objects by Using the CIE System

E284-22

Standard Terminology of Appearance